Pi B 2 Processors

[Milliways]

I have just received my B2.
I noticed `/proc/cpuinfo` shows 4 processors but `lshw` shows cpu 1-3 disabled.

Are they in fact disabled?
I didn't really expect the new kernel to be using all cores yet, but how else would you explain benchmarking showing 6x performance?

[ktb]

Interesting. I don't know. I do see the same thing using lshw.

I'm fairly sure more than one core is working. I suppose conky could be lying.

[riklaunim]

Many ARM SoCs disables cores if there is no work for them. If you star many resource hungry processes you should see how those cores start to work. Power saving feature

[DougieLawson]

https://packages.debian.org/wheezy/lshw

I'd suspect a bug in the code (or the info it uses is unavailable on an ARM).

[jamesh]

https://packages.debian.org/wheezy/lshw

I'd suspect a bug in the code (or the info it uses is unavailable on an ARM).

+1, my tests show all cores working fine.

[DougieLawson]

Even plain old top shows four cores running

Code: Select all

top - 13:37:46 up 10 min,  2 users,  load average: 0.13, 0.20, 0.13
Tasks: 120 total,   1 running, 119 sleeping,   0 stopped,   0 zombie
%Cpu0  :  1.3 us,  1.7 sy,  0.0 ni, 97.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu1  :  0.3 us,  0.7 sy,  0.0 ni, 99.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu2  :  1.0 us,  0.7 sy,  0.0 ni, 98.4 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu3  :  0.0 us,  0.3 sy,  0.0 ni, 99.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem:    884304 total,   384512 used,   499792 free,    33460 buffers
KiB Swap:   102396 total,        0 used,   102396 free.   193276 cached Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 1748 root      20   0   29004  10356   4984 S   1.3  1.2   0:03.42 wicd
 2386 root      20   0    5044   2416   2056 R   1.0  0.3   0:00.38 top
  731 message+  20   0    5508   3152   2692 S   0.7  0.4   0:01.78 dbus-daemon
 1752 root      20   0   18976  12308   7964 S   0.7  1.4   0:01.33 wicd-monit+
  981 mysql     20   0  568772  55324  11976 S   0.3  6.3   0:01.33 mysqld
 1392 root      20   0   22104   4508   3352 S   0.3  0.5   0:00.05 nmbd
 2260 root      20   0   11788   5196   4504 S   0.3  0.6   0:00.94 sshd
    1 root      20   0   31652   4284   2728 S   0.0  0.5   0:08.31 systemd
    2 root      20   0       0      0      0 S   0.0  0.0   0:00.00 kthreadd
    3 root      20   0       0      0      0 S   0.0  0.0   0:00.11 ksoftirqd/0
    5 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/0:+
    6 root      20   0       0      0      0 S   0.0  0.0   0:00.13 kworker/u8+
    7 root      20   0       0      0      0 S   0.0  0.0   0:00.36 rcu_preempt
    8 root      20   0       0      0      0 S   0.0  0.0   0:00.01 rcu_sched

[caldimerda]

I agree the processors are working fine. I'm using handbrake to generate an mpeg and ps tells me it's so far clocked up more than 9 hours of processor time in just 2.5 hours.

I don't think I'll be repeating the exercise since it still says it has 7 hours to go.

[hare9821]

I have same problem

my lshw dump : http://pastebin.com/ayDeUjVU

I put system on a high cpu usage situation (with a heavy calculation python code) but nothing changed in lshw.

interesting note:
during heavy code execution, I see %99 cpu usage in top (command) output BUT in my GUI task manager, cpu usage does not exceed %20 - %30.

another interesting note:
mpstat command (from sysstat package) shows that more than one cpu is working. but @ 1% - 2%
mpstat output : http://pastebin.com/P8FhXxTB

i think something is not correct here.
expert friends please help